CN114486525A - Fiber monofilament force resistance response online testing device and testing method - Google Patents
Fiber monofilament force resistance response online testing device and testing method Download PDFInfo
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- CN114486525A CN114486525A CN202210083134.9A CN202210083134A CN114486525A CN 114486525 A CN114486525 A CN 114486525A CN 202210083134 A CN202210083134 A CN 202210083134A CN 114486525 A CN114486525 A CN 114486525A
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention discloses a fiber monofilament force resistance response online testing device and a testing method, comprising the following steps: the device comprises fiber monofilaments, a fixed die, a single fiber strength tester, a camera, image acquisition control equipment, a computer control acquisition system and a resistance tester. The fiber monofilament is conductive fiber, two wire electrodes are arranged on a fixed die respectively and used for being connected with a resistance instrument, the two fiber electrodes are connected with the fiber monofilament, the single fiber strength instrument respectively clamps the upper end and the lower end of the fixed die through an upper clamp and a lower clamp, a camera is used for shooting random speckle images on the surface of the fixed die, collected image signals are sent to an image collection control device and used for obtaining deformation data of the fiber monofilament, a computer control collection system can control the single fiber strength instrument and stretch a test fiber monofilament sample and can obtain test force data, the resistance instrument is connected with the wire electrodes in the fixed die through connecting wires, and resistance data of the fiber monofilament sample are collected continuously.
Description
Technical Field
The invention relates to the field of fiber monofilament mechanical and electrical performance testing, in particular to a fiber monofilament mechanical resistance response online testing device and a testing method.
Background
The carbon fiber and silicon carbide fiber reinforced composite material has the characteristics of high specific strength and specific modulus, and is an ideal material for manufacturing aerospace structures. However, due to the severe service environment, the structure is easily damaged, and if the damage cannot be detected in time, the more serious structural failure will result, so it is necessary to perform damage monitoring on the composite material structure to ensure the safety and reliability. The resistance detection is a research hotspot for detecting the structural damage of the composite material at present. The technology is a real-time online monitoring means, and the material is required to have conductivity. Carbon fiber or silicon carbide fiber reinforced composites generally have electrical conductivity. When the interior of the structure is damaged, the conductivity of the structure can be changed correspondingly, namely the structure has a damage self-checking characteristic, and the damage condition of the whole structure can be judged by analyzing the change of the resistance value. Knowledge of the mechanical resistance response of the components of the composite is a prerequisite for the development of resistance-based monitoring of structural damage to the composite. The fiber-reinforced phase is the primary load-bearing structure in the fiber-reinforced composite. Therefore, accurate acquisition of the mechanical resistance response of the fiber is one of the cores for realizing damage monitoring of the composite material based on the resistance.
The fibers in the composite material are generally referred to as fiber bundles, and the fiber bundles are generally formed by bundling a plurality of monofilaments, so that the mechanical resistance characteristic of the fiber bundles can be further obtained by acquiring the mechanical resistance response of the monofilaments of the fibers. However, fiber filaments are small in diameter (typically several microns to tens of microns) and are brittle (such as silicon carbide fibers and carbon fibers) with a failure load of 10-1Bovine grade, and therefore neither conventional test equipment nor measurement methods are applicable. In the prior art, the Tensile strength tests for fiber filaments were carried out in most cases with reference to ASTM D3379-Strength and Young's Module for High Module Single fiber Fibers, but the method only for brittle fiber filaments to develop tensile Strength and Modulus test; patent CN103954836B "a method for testing volume resistivity of carbon fiber monofilament and a testing bracket used by the same" discloses a device and a method for statically measuring volume resistivity of fiber, but the method cannot dynamically obtain the resistance change of the fiber monofilament in the stretching process in real time, and even cannot obtain the change curve of the resistance along with load or deformation.
At present, no testing standard and method for the on-line testing of the fiber monofilament resistance response exist in the technical data published at home and abroad, and the prior art cannot obtain the variation curve of the fiber monofilament resistance along with the load, so that the accurate resistance response characteristic of the fiber monofilament cannot be obtained.
Accordingly, there is a need for improvements in the prior art to address the deficiencies of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an on-line testing device and a testing method for the mechanical resistance response of fiber monofilaments.
In order to realize the purpose, the invention adopts the following technical scheme:
a fiber monofilament resistance response online testing device comprises a fiber monofilament, a fixed die, a resistance meter, a single fiber strength meter, a camera, an image acquisition control device and a computer control acquisition system, wherein the fixed die is insulated and draws a fixed die cutting line, one surface of the fixed die draws a random speckle image, the other surface of the fixed die is sprayed with conductive spray paint, the fiber monofilament is conductive fiber, two ends of the fiber monofilament are respectively fixed at the upper end and the lower end of the conductive spray paint surface of the fixed die, the fixed contact point is a fiber electrode, the upper end and the lower end of the conductive spray paint surface of the fixed die are respectively provided with a lead electrode, the fiber electrode and the lead electrode are in conductive connection through the spray paint surface, the lead electrode is connected with the resistance meter through a lead, the single fiber strength meter fixedly clamps the upper end and the lower end of the fixed die, the fixed die is cut along the fixed die cutting line, the upper end and the lower end of the camera are separated, the upper end and the lower end of the camera respectively comprise a fiber electrode and a wire electrode, and the camera is used for shooting random speckle images on the surface of the fixed die and sending the collected images to the computer-controlled collecting system.
On the basis of the above scheme, a further improved or preferred scheme further comprises:
furthermore, the fixed die is a C-shaped sheet paper card, random speckle images are generated by a computer program and are printed on one surface of the fixed die, the conductive spray paint is completely and uniformly sprayed on the other surface of the fixed die in a spraying mode, and the cutting line of the fixed die is drawn in the middle of the fixed die.
Furthermore, cross-shaped centering dotted lines are drawn at two ends of the fixed die respectively, and two ends of the fiber monofilament are fixedly adhered to the central point of the cross-shaped centering dotted line on the conductive spray paint surface of the fixed die by conductive silver adhesive respectively to form a fiber electrode.
Furthermore, the wire electrode is formed by arranging two small holes at the upper end and the lower end of the fixed die, the wire is fixed at the small holes in a perforation winding mode, and conductive silver adhesive is coated on the small holes and the wire on the conductive paint spraying surface of the fixed die to reinforce the contact position of the wire and the fixed die.
Further, the wire is a single-core single-strand copper wire.
Furthermore, the single fiber strength tester clamps the upper end and the lower end of the fixed die through an upper clamp and a lower clamp respectively, and the surface of the contact surface of the clamps and the fixed die is an insulating surface.
Furthermore, the computer-controlled acquisition system can control the single-fiber strength tester to stretch the cut fixed die and acquire test force data, and the resistance tester is connected with the lead electrodes in the fixed die through connecting leads to continuously acquire resistance data of the fiber monofilaments.
The invention also provides a testing method based on the fiber monofilament mechanical resistance response online testing device, which comprises the following steps:
s1: putting the paper card into a printer, and printing a random speckle pattern generated by a computer program on one surface of the paper card;
s2: spraying conductive paint on the other surface of the printed paper card, waiting for air drying for a moment, ensuring that the conductive paint completely and uniformly covers the other surface of the paper card in the spraying process, cutting the paper card into a specified C shape, and finishing the preparation of a fixed mold;
s3, drawing a cross-shaped centering dotted line at the upper end and the lower end of the opening side of the prepared fixed mould spraying conductive paint spraying surface by using a black pen, ensuring that the connecting line of the central points of the cross-shaped centering dotted line is parallel to the edge of the fixed mould, the distance between the central points is the length of the fiber monofilament, and drawing a cutting line of the fixed mould at the symmetrical folding position of the fixed mould;
s4, using pins to open a small hole on each non-opening side of the fixed mould;
s5, after the end parts of the two leads are stripped of the insulating layers, the two leads respectively pass through the two small holes in the step S4, the edges of the non-opening side of the fixed die are wound on the original leads and are twisted for 3-4 circles, the leads are ensured to be firmly fixed at the upper end and the lower end of the non-opening side of the fixed die, the leads positioned on the surface of the fixed die are not influenced when the led-out leads move, then conductive silver adhesive is coated on the leads on the surface of the fixed die sprayed with the conductive paint, and the leads are solidified statically, so that the preparation of the lead electrode is completed;
s6, separating the fiber monofilament from a bundle of fiber bundle, respectively placing the two ends with the standard length cut at the center point of the cross centering dotted line in the step S2, smearing conductive silver adhesive at the two ends of the fiber monofilament, standing and curing the conductive silver adhesive, and thus completing the preparation of the fiber electrode;
s7, clamping the fixing mould adhered with the fiber monofilaments onto an upper clamp and a lower clamp of a single fiber strength tester, wherein the positions of fiber electrodes and lead electrodes are avoided during clamping; and connecting the lead at the lead electrode to a resistance meter;
s8, shooting the random speckle pattern on the fixed mould by a camera, adjusting the shooting distance and the focal length of the camera to ensure that the sample speckles are all in the visual field and clearly form images, and setting a shooting interval;
s9, cutting the fixed die along the cutting line of the fixed die in the step S3 to separate the upper end and the lower end of the fixed die, simultaneously starting a single fiber strength instrument, an image acquisition control device and a resistance instrument, descending a lower chuck of the single fiber strength instrument to start to stretch the fiber monofilament, recording test force data, recording an image of the random speckle pattern surface of the fixed die by the image acquisition control device, and simultaneously acquiring resistance data of the fiber monofilament by the resistance instrument to realize the on-line measurement of the force resistance response of the fiber monofilament.
Wherein:
in step S7, insulating tapes are adhered to the clamping surfaces of the upper and lower clamps of the single fiber strength tester in advance to perform an insulating process.
In step S8, the shooting distance of the camera is 1.5m, the focal length is 50mm, and the shooting interval is 0.2S/piece.
The invention provides an on-line testing device and a testing method for the mechanical resistance response of fiber monofilaments, which have the following advantages:
1. the resistance of the fiber monofilament is measured indirectly, the fixed die is made to be conductive through spraying of the conductive spray paint, and the fiber electrode and the lead electrode which are arranged on the fixed die are connected, so that the resistance measurement problem of the fiber monofilament during a loading test is solved. The related testing device has simple structure, small difficulty of sample preparation and testing operation steps and low test cost.
2. According to the invention, the light single-strand single-core wire is selected, and the wire electrode is arranged in a perforation winding fixing mode, so that the influence of the self weight of the wire on the conductive fixing and fixing die and the electrode is effectively reduced, and the stability and the precision of the fiber monofilament resistance measurement are improved.
3. According to the invention, the clamping surfaces of the upper clamp and the lower clamp of the single fiber strength tester are subjected to insulation treatment, so that the interference of the resistance of the single fiber strength tester on the resistance measurement of the single fiber is avoided, and the measurement precision is improved.
4. According to the invention, the deformation of the fiber monofilaments is measured by adopting a non-contact deformation measurement method, and compared with the deformation data obtained in a single fiber strength tester, the deformation data is more accurate, and the test precision of the scheme is further improved.
5. In order to avoid the fiber monofilament sample from being bent and twisted to break, the fixed mold selects a paper card with a slightly thicker thickness and stronger fiber tenacity.
Drawings
FIG. 1 is a schematic diagram of an on-line measuring device for the force resistance response of a fiber monofilament of the present invention;
FIG. 2 is a schematic structural view of a C-shaped conductive fixing mold for fiber monofilaments according to the present invention;
FIG. 3 is a schematic structural diagram of the preparation of the lead electrode in the C-shaped conductive fixing mold for the fiber monofilaments of the present invention;
FIG. 4 is a random speckle print pattern generated by the computer program of the present invention;
FIG. 5 is a graph of the experimental force versus the rate of change of resistance strain for a silicon carbide fiber monofilament in an example of the present invention;
reference numerals: 1-fiber monofilament, 2-fixed die, 3-cross centering dotted line, 4-fiber electrode, 5-lead electrode, 6-lead, 7-small hole and 8-fixed die cutting line.
Detailed Description
In order to clarify the technical solution and the working principle of the present invention, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1, the fiber monofilament resistance response online measuring device comprises a fixed mold 2 provided with a conductive fiber monofilament 1, a single fiber strength tester, a camera, an image acquisition control device, a computer control acquisition system and a resistance tester. The fiber monofilament 1 is a conductive fiber, such as a silicon carbide fiber monofilament, which is separated from a bundle of silicon carbide fibers; the fixed mold 2 is a paper card with a slightly thick thickness and strong fiber tenacity, as shown in fig. 2, a layer of conductive silver paint is sprayed on the front surface of the fixed mold 2, and random speckle patterns are printed on the back surface of the fixed mold 2; the fiber monofilaments 1 are placed along a cross-shaped central dotted line 3 on a fixed die, and are adhered and fixed by conductive silver adhesive to manufacture a fiber electrode 4; the lead 6 is a single-core single-strand copper lead and is fixed on the fixed die 2 through conductive silver adhesive to manufacture a lead electrode 6. Specifically, as shown in fig. 3, the lead 6 passes through the small hole 7 on the fixed mold 2, and the edge of the non-opening side of the fixed mold 2 is wound on the original lead 6 and twisted for 3-4 turns, so that the lead is firmly fixed at the upper and lower ends of the non-opening side of the fixed mold 2, and then the lead 6 on the conductive surface of the fixed mold 2 is coated with conductive silver paste for fixation. The single fiber strength tester clamps the upper end and the lower end of the fixed die 2 and is connected to a computer control acquisition system to acquire test force data in a test process, the resistance tester is connected with a lead electrode 5 through a lead 6 to acquire resistance value data of the fiber monofilament 1, a camera (namely an industrial camera) acquires random speckle pictures on the back of the fixed die 2, and the image acquisition control equipment compares the deformation pictures at different moments through a non-contact measurement algorithm to calculate the deformation condition of the fiber monofilament sample 1.
The testing method adopting the fiber monofilament mechanical resistance response on-line measuring device comprises the following experimental steps:
s1, putting the uncut paper card into a printer, and printing a random speckle pattern generated by the computer program shown in the figure 4 on one surface of the uncut paper card;
s2, spraying conductive paint on the other side of the printed paper card, waiting for air drying for a moment, ensuring that the conductive paint completely and uniformly covers one side of the paper card in the spraying process, cutting the paper card into a C shape (40 mm 15mm rectangle, opening size 20mm 10 mm) with specified size, and completing the preparation of the fixed mold 2;
s3, drawing a cross-shaped centering dotted line 3 (the distance between the center point and the edge is 5 mm) at the upper end and the lower end of the opening side of the conducting surface of the prepared fixed mold 2 by using a black pen, ensuring that the connecting line of the center points of the two is parallel to the edge of the fixed mold, and ensuring that the distance between the center points is 30 mm;
s4, respectively forming small holes 7 with the diameter of about 0.5mm at positions 5mm away from the edge and 5mm away from the upper edge and the lower edge of the non-opening side of the fixed die 2 by using pins;
s5, peeling the insulating layers of about 20mm from the two leads 6, then respectively penetrating the two upper and lower small holes 7, bending the two leads to the edge of the non-opening side, and winding and twisting 3-4 circles on the original leads 6 to ensure that the leads 6 are firmly fixed at the upper and lower ends of the non-opening side of the fixed mold 2, and the leads 6 on the surface of the fixed mold 2 are not influenced when the led-out leads 6 move;
s6, coating conductive silver adhesive on the upper and lower small holes 7 of the conductive surface of the fixed mould 2, and curing to finish the preparation of the lead electrode 5, wherein the model of the conductive silver adhesive used in the test is 8813X quick-drying conductive silver adhesive;
s7, cutting the fiber monofilament 1 which is a silicon carbide fiber monofilament with a standard length of 30mm, respectively placing the upper end and the lower end at the central point of the cross-shaped centering dotted line 3, paying attention to ensure the centering of the upper end and the lower end, and coating the upper end and the lower end of the fiber monofilament 1 with conductive silver adhesive to complete the preparation of the fiber electrode 4;
s8, sticking insulating tapes on the clamping surfaces of the upper and lower chucks of the single fiber strength tester to ensure that the self resistance of the single fiber strength tester does not influence the subsequent resistance measurement;
s9, clamping the fixed mould 2 adhered with the fiber monofilament 1 to the upper and lower chucks of the single fiber strength tester, and avoiding the positions of the fiber electrode 4 and the lead electrode 5 by referring to a horizontal line connecting two points in the center of the cross centering dotted line 3 during clamping; and the lead 6 is connected to a resistance meter, the type of a single fiber strength tester used in the test is YG004, and the type of the resistance meter is Keithley DAQ 6510;
s10, opening a camera and image acquisition control equipment, adjusting the shooting distance to 1.5m, adjusting the focal length to 50mm, adjusting the observation visual field to the back of the fixed mold 2 to obtain a good random speckle clear image, wherein the camera in the experiment adopts an AVT (automatic video tape recorder) F-201B black-and-white industrial camera, the lens adopts a computer 50mm fixed-focus industrial camera lens, and the image acquisition control equipment comprises a computer and image acquisition software;
s11, cutting the fixed die 2 along the fixed die cutting line 8 shown in the figure 2, simultaneously starting a single fiber strength instrument and a resistance instrument, descending a lower chuck of the single fiber strength instrument to start to stretch the fiber monofilament 1, keeping the random speckle images of the upper half part of the fixed die 2 still, moving the random speckle images of the lower half part of the fixed die 2 downwards along with the downward movement of the lower chuck, recording test force and displacement data by the computer control acquisition system, and simultaneously acquiring resistance data of the fiber monofilament 1 by the resistance instrument to realize the on-line measurement of the fiber monofilament force resistance response.
S12, the curves of the test force of the silicon carbide fiber monofilament after the test and the change rate of the resistance with the change of the strain are shown in fig. 5.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention may be apparent to those skilled in the relevant art and are intended to be within the scope of the present invention.
Claims (10)
1. A fiber monofilament mechanical resistance response online testing device comprises a fiber monofilament (1), a fixed die (2), a resistance meter, a single fiber strength meter, a camera, image acquisition control equipment and a computer control acquisition system, and is characterized in that the fixed die (2) is insulated and is drawn with a fixed die cutting line (8), one side of the fixed die (2) is drawn with a random speckle image, the other side of the fixed die is sprayed with conductive paint, the fiber monofilament (1) is conductive fiber, two ends of the fiber monofilament (1) are respectively fixed at the upper end and the lower end of the conductive paint surface of the fixed die (2), a fixed contact point is a fiber electrode (4), the upper end and the lower end of the conductive paint surface of the fixed die (2) are respectively provided with a wire electrode (5), and the fiber electrode (4) and the wire electrode (5) are in conductive connection through the paint surface, wire electrode (5) pass through wire (6) connecting resistance appearance, the fixed upper and lower both ends of centre gripping fixed die utensil (2) of single fiber brute force appearance, cut out fixed die utensil (2) along fixed die cutting line (8), make its upper and lower both ends separation, upper and lower both ends respectively contain a fiber electrode (4) and wire electrode (5), the camera be used for shooting the random speckle image on fixed die utensil (2) surface to the image transmission who will gather sends to computer control collection system.
2. The fiber monofilament mechanical resistance response online testing device according to claim 1, wherein the fixed die (2) is a C-shaped sheet paper card, the random speckle image is generated by a computer program and printed on one side of the fixed die (2), the conductive paint is completely and uniformly sprayed on the other side of the fixed die (2) in a spraying manner, and the fixed die cutting line (8) is drawn in the middle of the fixed die (2).
3. The fiber monofilament mechanical resistance response online testing device according to claim 1, wherein a cross-shaped centering dotted line (3) is drawn at each end of the fixed mold (2), and each end of the fiber monofilament (1) is fixedly adhered to the center point of the cross-shaped centering dotted line (3) on the conductive spray paint surface of the fixed mold (2) by using conductive silver adhesive to form a fiber electrode (4).
4. The fiber monofilament mechanical resistance response online testing device according to claim 1, wherein the wire electrode (5) is provided with two small holes (7) at the upper end and the lower end of the fixed mold (2), the wire (6) is fixed at the small holes (7) in a perforation winding manner, conductive silver adhesive is coated at the small holes (7) and the wire (6) on the conductive spray paint surface of the fixed mold (2), and the contact position of the wire (6) and the fixed mold (2) is reinforced.
5. A fibre monofilament mechanical resistance response on-line test device according to claim 1, characterized in that the conductor (6) is a single core single strand copper conductor.
6. The on-line testing device for the mechanical resistance response of the single fiber of claim 1, characterized in that the single fiber strength tester clamps the upper and lower ends of the fixed mold (2) through upper and lower clamps respectively, and the surface of the contact surface of the clamps and the fixed mold (2) is an insulating surface.
7. The device for on-line testing the mechanical resistance response of the fiber monofilaments as claimed in claim 1, wherein the computer-controlled acquisition system can control a single-fiber strength tester to stretch the cut fixed die (2) and acquire test force data, and the resistance tester is connected with the lead electrodes (5) in the fixed die (2) through connecting leads (6) to continuously acquire the resistance data of the fiber monofilaments (1).
8. The testing method of the fiber monofilament mechanical resistance response online testing device according to claim 1, characterized by comprising the following steps:
s1: putting the paper card into a printer, and printing a random speckle pattern generated by a computer program on one surface of the paper card;
s2: spraying conductive paint on the other surface of the printed paper card, waiting for air drying for a moment, ensuring that the conductive paint completely and uniformly covers the other surface of the paper card in the spraying process, cutting the paper card into a specified C shape, and finishing the preparation of the fixed mold (2);
s3, drawing a cross-shaped centering dotted line (3) at the upper end and the lower end of the opening side of the spraying conductive painting surface of the prepared fixed mold (2) by using a black pen, ensuring that the connecting line of the central points of the cross-shaped centering dotted line (3) is parallel to the edge of the fixed mold (2), the distance between the central points is the length of the fiber monofilament (1), and drawing a fixed mold cutting line (8) at the symmetrical folding position of the fixed mold (2);
s4, using pins to open a small hole (7) on the non-opening side of the fixed mould (2);
s5, the end parts of the two leads (6) are stripped of the insulating layer and then respectively pass through the two small holes (7) in the step S4, the edges of the non-opening side of the fixed die (2) are wound on the original leads and are twisted for 3-4 circles, the leads (6) are ensured to be firmly fixed at the upper end and the lower end of the non-opening side of the fixed die (2), the leads (6) on the surface of the fixed die (2) are not influenced when the led-out leads (6) move, then the leads (6) on the surface of the fixed die (2) sprayed with the conductive spray paint are coated with conductive silver paste and are solidified statically, and then the preparation of the lead electrode (5) is completed;
s6, separating the fiber monofilament (1) from a bundle of fiber bundles, respectively placing two ends of the fiber monofilament (1) with the standard length cut at the central point of the cross-shaped centering dotted line (3) in the step S2, smearing conductive silver adhesive at the two ends of the fiber monofilament (1), standing and curing the conductive silver adhesive, and finishing the preparation of the fiber electrode (4);
s7, clamping the fixing mould (2) adhered with the fiber monofilament (1) on an upper clamp and a lower clamp of a single fiber strength tester, and avoiding the positions of the fiber electrode (4) and the lead electrode (5) during clamping; and connecting the lead (6) at the lead electrode (5) to a resistance meter;
s8, shooting the random speckle pattern on the fixed mould (2) by a camera, adjusting the shooting distance and the focal length of the camera to ensure that the sample speckles are all in the visual field and form images clearly, and setting a shooting interval;
s9, cutting the fixed die (2) along the fixed die cutting line (8) in the step S3 to separate the upper end and the lower end of the fixed die, simultaneously starting a single fiber strength instrument, an image acquisition control device and a resistance instrument, descending a lower clamping head of the single fiber strength instrument, starting to stretch the fiber monofilament (1), recording test force data, recording an image of the random speckle pattern surface of the fixed die (2) by the image acquisition control device, and simultaneously acquiring resistance data of the fiber monofilament (1) by the resistance instrument to realize the on-line measurement of the force resistance response of the fiber monofilament (1).
9. The method as claimed in claim 8, wherein in step S7, the insulation tapes are adhered to the clamping surfaces of the upper and lower clamps of the monofilament tenacity meter in advance to realize the insulation treatment.
10. The method as claimed in claim 8, wherein in step S8, the camera has a shooting distance of 1.5m, a focal length of 50mm, and a shooting interval of 0.2S/piece.
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